HF 170 Wire Feed Motor Losing Power Under Load(Arc)
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  1. #1

    HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    I've had this 170 Chicago Electric welder for about about 6 years, and besides the finicky wire feeder, not many other negatives. Worked great for years. Even built a belly pan for my Toyota dual cases out of 3/8 steel. Welder is champ when working correctly.
    CURRENT ISSUE- seems to have trouble feeding once you start welding (as soon as the arc is established) the motor speed competely drops off and the arc sputters. Like the power is being suckedfrom the drive motor.
    -bought the vulcan liner, trimmed to fit and the wire now glides much easier. But the motor is still fizzelingout when starting to weld, lost at this point and need to finish the steering and hyrdo ram assist on my rig.

  2. #2

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    Its a MIG 170, With argon/co2 shielding gas.
    Wondering if the following could be bad;
    -Bridge
    -Control Board
    -Motor
    Ways to test all the above with a DVOM?

  3. #3

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    Update: Opened it up today after work to ohm the feeder motor and go over everythingName:  20190514_190533.jpg
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    And I notice one of the connections in the bridge is blown... and seeing the others around it smoky and the insulation at the bases are almost boiled looking, cooked kind of.
    Then after reading up and trying to look at some wiring schematics, the wire feeder motor may have a connection to the bridge/rectifier ?
    Thoughts?

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    Then got to the feed motor, Ohm'd it out and at first pulled the plug connector and was getting 7.0 Ohms. Went to the motor terminals worked the insulation back and was getting it jumping 20+ohms.
    Thought maybe crappy corrosion on the bronze lugs. Went back to wire connector and was now getting ~15ohms still jumping around went to the motor jiggled the termnials around checked again now 0.001 mOhms. Okay checked back and forth same 0.001 mOhms. Is there a bad connection in the motor maybe? The brushes look intact maybe the springs are worn?

    And if anyone knows of interchangle parts for these 170/180 that would help
    Attached Images Attached Images  
    Last edited by YotaCrawler; 05-15-2019 at 03:04 AM.

  4. #4
    Join Date
    Jan 2009
    Location
    Sonoma County
    Posts
    780

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    re parts for the 170: There are listings on Ebay for some of the components. It seems many models of welders built in China are based on the same common components.
    Last edited by California; 05-15-2019 at 02:17 PM.
    HF MIG-180 with all the mods.
    Grizzly H8153 Stick/Tig Pulse 130/160.
    Wards PowrKraft AC-230. Stick & carbon arc.

  5. #5
    Join Date
    Aug 2018
    Location
    College Station, Tx
    Posts
    15

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    I know this is an old thread, but did you ever find a replacement rectifier or diodes? I have the same problem.
    thanks

  6. #6

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    I have look the rectifiers they look like about 50 amps at 100% power.
    So when mind goes bad I plan to buy from Amazon a full wave 100 amp rectifier
    https://www.amazon.com/dp/B07DBPC8PM..._ovx0DbG4S6W81
    HF 170 welder
    HF 4x6 band saw
    South Bend 9N
    Mill
    B&D mag drill
    Victor torch

  7. #7
    Join Date
    Jan 2009
    Location
    Sonoma County
    Posts
    780

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    Quote Originally Posted by smithdoor View Post
    I have look the rectifiers they look like about 50 amps at 100% power.
    So when mind goes bad I plan to buy from Amazon a full wave 100 amp rectifier
    https://www.amazon.com/dp/B07DBPC8PM..._ovx0DbG4S6W81
    Good find! 200A! (It sounds like HF's originals are being run way beyond spec).

    How big of a heat sink will that rectifier assembly need?
    Last edited by California; 11-17-2019 at 01:43 PM.
    HF MIG-180 with all the mods.
    Grizzly H8153 Stick/Tig Pulse 130/160.
    Wards PowrKraft AC-230. Stick & carbon arc.

  8. #8

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    Quote Originally Posted by California View Post
    Good find! 200A! (It sounds like HF's originals are being run way beyond spec).

    How big of a heat sink will that rectifier assembly need?
    Using a calculation it is Estimated Heat Sink Volume
    5000.0
    cm3

    https://celsiainc.com/heat-sink-size-calculator/

    I would double the size the HF has. It would work be for now using a under size low cost rectifiers.

    Dave
    Last edited by smithdoor; 11-17-2019 at 11:32 PM.

  9. #9

    Re: HF 170 Wire Feed Motor Losing Power Under Load(Arc)

    Quote Originally Posted by California View Post
    Good find! 200A! (It sounds like HF's originals are being run way beyond spec).

    How big of a heat sink will that rectifier assembly need?
    Here what you need

    Dave

    https://www.amazon.com/dp/B07DBPC8PM/ref=cm_sw_r_other_apa_i_ovx0DbG4S6W81

    https://www.amazon.com/Aluminum-Heat...1ZVNDAE4SS3V4V

    https://www.amazon.com/GENNEL-Conduc...1ZVNDAE4SS3V4V
    Last edited by smithdoor; 11-18-2019 at 10:15 AM.

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